题目

KANDAHAR, Afghanistan–-- Afghans burned tires and chanted (诵扬)“Death to America” after U.S troops(军队) fired Monday(April 12, 2010) on a civilian bus near Kandahar, killing four people and wounding more than a dozen. Afghanistan’s president accused(指责) NATO（North Atlantic Treaty Organization） of breaking its commitment to safeguard civilian lives. The attack angered Afghan officials and the public in Kandahar, the Taliban’s birthplace, and dealt a blow(给与打击) to U.S and NATO efforts to win popular support for a coming offensive to drive the insurgents(叛3．如图，小明将一枚硬币放在碗底部，并向后移动到A处．因为光在均匀介质中沿直线传播，眼睛在A处恰好看不到它．沿碗壁缓缓向碗中加水，小明在A外又看到硬币的虚（选填“虚”或“实”）像，这是利用了光的折射现象．